Phosphor, production method thereof, phosphor-containing composition, light emitting device, and display and illuminating device

a technology of phosphor and phosphor, which is applied in the direction of solid-state devices, discharge tubes/lamp details, electrical apparatus, etc., can solve the problems of insufficient brightness of previously known green oxide phosphors, and achieve superior temperature characteristics, high emission intensity and brightness, and superior light-emitting devices

Inactive Publication Date: 2010-04-15
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0058]According to the present invention, a phosphor that stably shows high emission intensity and brightness as well as superior temperature characteristics, even under excitation by near-ultraviolet light, can be obtained. In addition, the use of a composition containing the phosphor can provide a superior light emitting device that hardly effects a color shift or decreases emission intensity. This light emitting device can be preferably used for displays or illuminating devices.

Problems solved by technology

However, previously known green oxide phosphors are still insufficient in terms of brightness and the like to be used as a green phosphor that is excited by a near-ultraviolet emitting semiconductor luminous element.

Method used

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  • Phosphor, production method thereof, phosphor-containing composition, light emitting device, and display and illuminating device
  • Phosphor, production method thereof, phosphor-containing composition, light emitting device, and display and illuminating device
  • Phosphor, production method thereof, phosphor-containing composition, light emitting device, and display and illuminating device

Examples

Experimental program
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Effect test

example 1

[0457]As phosphor materials, 0.552 g of barium carbonate (BaCO3), 0.211 g of europium oxide (Eu2O3). 0.261 g of basic magnesium carbonate (mass of 93.17 per 1 mole of Mg), 0.138 g of manganese carbonate (MnCO3), and 2.038 g of α-alumina (Al2O3) were weighed out and used. Also, as flux, 0.015 g (0.47 weight % relative to the total weight of the phosphor materials weighed out) of potassium fluoride (KF), which is a univalent metal element halide, were weighed out and used.

[0458]The phosphor materials and fluxes mentioned above were mixed in a mortar for 30 minutes and filled in an alumina crucible. In order to create a reducing atmosphere at the time of firing, bead-shaped graphites were placed in a space around the crucible. This mixture of the phosphor materials and flux was fired at 1550° C. for 2 hours under atmospheric pressure. The fired product obtained was ground, thereby to obtain a phosphor. The phosphor will be hereinafter referred to as the “phosphor of Example 1”.

[0459]Th...

examples 2 to 6

[0486]On each phosphor of Examples 2 to 6, emission spectrum and excitation spectrum were measured under excitation by light of 400 nm wavelength, and the emission spectrum characteristics and excitation spectrum characteristics were calculated, in the same procedure as Example 1.

[0487]The emission spectrum characteristics and excitation spectrum characteristics of respective phosphors of Examples 2 to 6 are shown in Table 5 below, together with the emission spectrum characteristics and excitation spectrum characteristics of the phosphor of Example 1.

TABLE 5Emission spectrum characteristics(excitation wavelength of 400 nm)Ratio of blue-emissionEmission-peakpeak intensity relative toExcitation spectrum characteristicswavelengthRelative emission-that of the greenReduction rate ofRate of change of(nm)peak intensity (%)*1emission peak (%)I(400) to I(340) (%)*2I(390) to I(382) (%)*3Example 15162024.5191.1Example 25171854.7231.5Example 35161994.5200.9Example 45162014.5191.1Example 5516196...

examples 7 to 9

[0491]On each phosphor of Examples 7 to 9, emission spectrum and excitation spectrum were measured under excitation by light of 400 nm wavelength, and the emission spectrum characteristics and excitation spectrum characteristics were calculated, in the same procedure as Example 1.

[0492]The emission spectrum characteristics and excitation spectrum characteristics of respective phosphors of Examples 7 to 9 are shown in Table 7 below, together with the emission spectrum characteristics and excitation spectrum characteristics of the phosphor of Example 1. Incidentally, the full width at half maximum of the emission peak of Example 8 was 26.5 nm.

TABLE 7Emission spectrum characteristics (excitation wavelength of400 nm)Ratio of blue-emissionpeak intensity relative toExcitation spectrum characteristicsEmission-peakRelative emission-that of the greenReduction rate ofRate of change ofwavelength (nm)peak intensity (%)*1emission peak (%)I(400) to I(340) (%)*2I(390) to I(382) (%)*3Example 151620...

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Abstract

To provide a phosphor that stably shows high emission intensity and brightness as well as superior temperature characteristics, under excitation by near-ultraviolet light, the phosphor contains an alkaline-earth metal aluminate and has a crystal phase comprising an alkali metal element and, in that crystal phase, the rate of substituted Eu (europium) to the number of sites which can be substituted with Eu of the crystal phase is 25% or higher and the ratio of the alkali metal element to the number of sites which can be substituted with Eu of the crystal phase is 3% or lower.

Description

TECHNICAL FIELD[0001]The present invention relates to a phosphor that emits green or blue fluorescence and a production method thereof, a phosphor-containing composition and light emitting device using the phosphor, and a display and illuminating device using the light emitting device. More particularly, it relates to a green or blue phosphor that shows high emission intensity even under excitation by near-ultraviolet light, a phosphor-containing composition and light emitting device using the green or blue phosphor, and a display and illuminating device using the light emitting device.BACKGROUND ART[0002]White light, which is essential in uses for an illuminating device and display, is generally obtained by mixing blue, green and red light emissions in accordance with the additive mixing principle of light. For backlights of color liquid crystal displays, which are a field of uses of displays, it is preferable that each of blue, green and red luminous bodies has as high emission in...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01J1/62C09K11/80H01L33/50
CPCC04B35/16C04B35/44H01L2224/45144H01L2224/48247H01L2224/48091C04B35/581C04B35/584C04B35/597C04B35/6262C04B2235/3206C04B2235/3213C04B2235/3215C04B2235/3217C04B2235/3224C04B2235/3262C04B2235/3852C04B2235/3865C04B2235/3873C04B2235/445C09K11/7734H01L33/502H01S5/005H01S5/32341H01L2924/00014H01L2924/00H01L2924/181H01L2224/45015H01S5/0087H01S5/18386H01L2924/20752H01L2924/00012
Inventor SETO, TAKATOSHIKIJIMA, NAOTOSHIMIZU, ETSUOSHIMIZU, KUMIE
Owner MITSUBISHI CHEM CORP
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